.  .    LIBRARY    .  . 

Connecticut 
Agricultural  College. 

VOL i..D...3.3.A 

CLASS    NO 3..3.0. 

COST... S..iLt. 

DATE ,\-^irsZ>...4 190..5... 


DEPARTMENT   OF   THE   INTERIOR 


MONOGRAPHS 


United  States  Geological  Survey 


VOLUME    XLVIII 


Part  II.-PL^TES. 


WASHINGTON 

GOVERNMENT     PRINTING     OFFICE 

1905 


Digitized  by  the  Internet  Archive 

in  2009  with  funding  from 

Boston  Library  Consortium  IVIember  Libraries 


http://www.archive.org/details/statusofmesozoicOOward 


UNITED  STATES  GEOLOGICAL  SURVEY 

CHARLES  D.  WALCOTT,  Director 


STATUS 


MESOZOIC  FLORAS  OF  THE  UNITED  STATES 


BY 

LESTER  F.  WARD 

with  the  collaboration  op 

William  M.  Fontaine,  Arthur  Bibbins,  and  G.  R.  Wieland 


I'art  II.-i^LATES. 


O 


WASHINGTON 

government    printing   office 
1905 


038"^. 


LIST  OF  THE  PLATES. 


Plate. 

Coniferous  plants  from  the  Trias  of  Arizona i-iil 

Sketch  map  of  the  Little  Colorado  Vallej',  Arizona,  and  adjacent  regions iv 

Sketch  map  of  the  Buck  Mountain  region  and  Cow  Creek  Valley,  Douglas  County,  Oreg v 

Jurassic  liverworts  and  ferns  from  Oregon. vi 

Jurassic  ferns  from  Oregon vii-xiv 

Jurassic  ferns  and  Equiseta  from  Oregon xv 

Jurassic  cycads  from  Oregon xvi-xxviii 

Jurassic  cycads  and  Williarasonias  from  Oregon xxix 

Jurassic  Gingkos  from  Oregon ; xxx-xxxiii 

Jurassic  Gingkoacese  and  Taxacese  from  Oregon xxxiv 

Jurassic  conifers  from  Oregon xxxv,xxxvi 

Miscellaneous  Jurassic  plants  from  Oregon xxxvii 

Jurasso-Cretaceous  plants  from  Oregon  and  Alaska j xxxviii 

Jurasso-Cretaceous  ferns  from  Cape  Lisburne,  Alaska xxxix-XLiii 

Jurasso-Cretaceous  cycads  and  Gingkoacese  from  Cape  Lisburne,  Alaska XLiv 

Jurasso-Cretaceous  conifers  from  Alaska,  Montana,  and  California _ XLV 

Jurassic  cycads  from  Wyoming xlvi-lxiii 

Sketch  map  showing  fossil  localities  of  the  Shasta  formation  of  California lxiv 

Ferns  from  the  Shasta  formation  of  California  and  Oregon lxv-lxvi 

Cycads  from  the  Shasta  formation  of  California  and  Oregon lxvii 

Cycads  and  conifers  from  the  Shasta  formation  of  California  and  Oregon Lxviii 

Conifers  and  dicotyledons  from  the  Shasta  formation  of  California  and  Oregon Lxix 

Cycadean  trunk  from  the  Shasta  formation  of  California _ lxx 

.  Ferns  from  the  Kootanie  formation  of  Montana lxxi 

Equiseta  and  cycads  from  the  Kootanie  formation  of  Montana Lxxii 

Cycads  and  conifers  from  the  Kootanie  formation  of  Montana  and  the  Lakota  formation  of 

South  Dakota Lxxiir 

Exposure  of  the  Potomac  formation  on  Ontario  avenue,  Washington,  D.  C. lxxiv 

Exposure  of  the  Potomac  formation  on  Kansas  avenue,  Washington,  D.  C lxxv 

Exposure  of  the  Potomac  formation  on  Sixteenth  street,  Washington,  D.  C. lxxvi 

Exposures  of  the  Potomac  formation  at  Terra  Cotta,  D.  C Lxxvii 

Exposures  of  the  Potomac  formation  at  Freestone,  Virginia Lxxvm 

Exposures  of  the  Potomac  formation  on  Back  Lick  Run,  Virginia lxxi.x 

Map  of  the  Potomac  terrane  in  Maryland,  the  District  of  Columbia,  and  adjacent  parts  of 

Virginia lxxx 


VI  LIST  OF  THE  PLATES. 

Plate. 

Cycad  trunk  and  silieiBed  wood  from  the  Potomac  of  Maryland. lxxxi 

Trunks  of  cycads  early  discovered  in  the  Potomac  of  Maryland lxxxii-lxxxvi 

Group  of  cycads  in  the  Museum  of  the  Woman's  College  of  Baltimore Lxxxvii 

View  of  the  Link  Gulch  with  the  Link  cycad  in  place lxxxyiii 

Group  of  cycads  in  the  Museum  of  the  Woman's  College  of  Baltimore Lxxxix 

Cycadeoidea  marylandica xo-xcii 

Cycadeoidea  Tysoniana xciii 

Cycadeoidea  McGeeana xciv 

Cycadeoidea  Fontaineana xcv-xcviii 

Cycadeoidea  Goucheriana xcix 

Cycadeoidea  Uhleri c 

Cycadeoidea  Bibbinsi ci-civ 

Cycadeoidea  Fisherje cv 

Cycadeoidea  Clarkiana cvi 

Fossil  plants  from  the  Potomac  of  Virginia,  the  District  of  Columbia,  and  Maryland cvii-cxix 


PLATE   I. 


PLATE    I. 

Triassic  Flora  of  Arizona. 

Akaucarites  shinabumpbnsis  Ward  n.  sp -. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIIl     PL.  I 


CONIFEROUS    PLANTS    FROM    THE    TRIAS    OF    ARIZONA. 


PLATE   II. 


PLATE     II. 

Triassic  Flora  of  Arizona. 

Page. 
Figs.  1,  2.  Araucarites  shinarumpensis  Ward  n.  sp -         30 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL. 


CONIFEROUS    PLANTS    FROM    THE    TRIAS    OF    ARIZONA. 


PLATE   III. 


PLATE     III. 

Triassic  Flora  of  Arizona. 

Akaucarites  monilifer  Ward  n.  sp 

Figs.  1,2.  Views  of  the  outer  surface  of  the  resinous  bodies  found  in  the  interior  of  silicified 
stumps. 
., .  Fig.  3.  View  of  the  interior  of  one  of  the  same  split  longitudinallj-  through  the  center. 
Fig.  4.  View  of  a  cross  section  of  one  of  the  same. 

Fig  5.  View  of  a  piece  of  the  wood  from  the  interior  of  a  stump  with  three  of  t!ie  resinous 
bodies  attached  to  it,  showing  their  moniliform  arrangement. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL. 


CONIFEROUS    PLANTS    FROM    THE    TRIAS    OF    ARIZONA. 


PLATE   IT. 


PLATE    IV. 

Sketch  map  of  tbe  Little  Colorado  Valley,  Arizona,  and  adjacent  regions. 


PLATE   V. 


PLATE     V. 

Page. 
Sketch  map  of  the  But-k  Mountain  region  and  part  of  the  Cow  Creek  Valley,  Douglas  County,  Oieg. , .         47 


PLATE   VI. 


MON  XLVUI — VOL  2 — 05 2 


PLATE    VI. 

Jurassic  Flora  of  Oregon. 

Page. 

FiCi.        1.  Marchantites  ekectus  (Bean)  Sew.? 53 

Fig.  2.  Enlargement  of  Fig.  1,  X  2. 
Fios.  3-9.  DicKSONiA  oREGONENSis  Font.  n.  sp 55 

Fig.  4.  Pinnule  of  Fig.  3  enlarged,  X  2. 
Fig.  6.  Pinnule  of  Fig.  5  enlarged,  X  2. 
Fig.  7.  Portion  of  Fig.  5  slightly  enlarged. 
Fig.  9.  Pinnule  of  Fig.  8  enlarged,  X  2. , 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  VI 


JURASSIC    LIVERWORTS    AND    FERNS    FROM    OREGON. 


PLATE   VII. 


,  PLATE    VII. 

Jurassic  Flora  of  Oregon. 

Figs.  1-10.  Dicksonia  obegonensis  Font.  n.  sp 

Fig.       3.  Pinnule  of  Fig.  2  enlarged,  X  2. 

Figs.  6-8.  Enlarged  sterile  pinnules  showing  nervation,  X  2. 

Fig.       9.  Enlarged  fertile  pinnules  showing  a  sorus,  X  2. 

Fig.      10.  Fertile  pinnule  showing  one  sorus  somewhat  more  enlarged  than  Fi; 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII      PL.  VII 


JURASSIC    FERNS    FROM    OREGON. 


PLATE  VIII. 


PLATE    VIII. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.      1-3.  Coniopteris  hv.menophylloides  (Brongn.)  Sew --. 59 

Figs.  2,  3.  Enlarged  pinnules  of  Fig.  1  showing  sori,  X  2. 
Figs.    4-1 1 .  Thyrsopteris  MuRR.4Y.iN.i  (Brongn. )  Heer ...'..._ 61 

Fig.  5.  Enlarged  pinnule  of  Fig.  4,  X  3. 
Fig.  6.  Enlarged  pinnule  of  Fig.  4,  X  2. 
Fig.  8.  Enlarged  pinnules  of  Fig.  7,  X  2. 
Fig.  10.  Enlarged  pinnule  of  Fig.  9,  X  4. 
Fig.  11.  Enlarged  pinnule  of  Fig.  9,  X  2. 

Figs.  12-1.5.  Folypodiuji  oreoonense  Font.  n.sp.._ 63 

Fig.  13.  Enlarged  pinnule  of  Fig.  12,  X  2. 
Fig.  li.  Portion  of  a  pinnule  of  Fig.  12   X  4. 


U.  S.  QEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  VIM 


JURASSIC    FERNS    FROM    OREGON. 


PLATE   IX. 


PLATE    IX. 

Jurassic  Flora  of  Oregon. 

Page. 

Figs.  1-S.  Polypodium  okboonensb  Font.  n.  sp 63 

Fig.  2.  Enlarged  pinna  of  Fig.  1,  X  2. 
Figs.  4,  5.  Enlarged  pinnules  of  Fig.  3,  X  2. 
Fig.  8.  Enlarged  pinnule  of  Fig.  7,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  IX 


JURASSIC    FERNS    FROM    OREGON. 


PLATE   X 


PLATE    X. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.    1-7.  Poi.vpodium  orbgonense  Font.  n.  sp 63 

Fig.  3.  Enlarged  pinnules  of  Fig.  2,  X  2. 

Fig.  .5.  Portion  of  a  pinnule  of  Fig.  4  enlarged  to  show  the  sori,  X  2. 

Fig.  6.  Enlarged  sterile  pinnule  showing  the  nervation,  X  2. 

Fig.  7.  Enlarged  fertile  pinnules  showing  a  sorus,  X  2. 

Figs.  S-12.  Cladophlebis  vaccensis  VA'ard  n.  sp... 66 

Fig.    9.  Enlarged  pinnule  of  Fig.  S.  X  2. 
Fig.  11.  Enlarged  pinnule  of  Fig.  10,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  X 


JURASSIC    FERNS    FROM     OREGON. 


PLATE   XI 


PLATE    XI. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.      1-7.  Cladophlebis  denticul.4ta  (Brongn. )  Nath 68 

Fig.  2.  Enlarged  pinnule  of  Fig.  1,  X  3. 

Fig.  4.  Enlarged  pinnules  of  Fig.  3,  X  2. 

Fig.  7.  Enlarged  pinnule  showing  the  nervation. 
Figs.    8-10.  Cladophlebis  iiaiburnensis  (L.  &  H. )  Brongn 71 

Figs.  9,  10.  Enlarged  pinnules  of  Fig.  8,  X  2. 
Figs.  11, 12.  Cladophlebis  acutiloba  (Heer)  Font.  n.  comb 72 

Fig.  12.  Enlarged  pinnule  of  Fig.  11. 
Figs.  13-15.  Cladophlebis  pecopteroides  Font.  n.  sp 73 

Figs.  14,  15.  Portions  of  Fig.  13  enlarged,  to  show  the  nervation. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XI 


JURASSIC    FERNS    FROM    OREGON. 


PLATE    XII. 


PLATE    XII. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.      1-3.  Sclekopteris  oregonensis  Font.  n.  sp 74 

Fig.  2.  Enlarged  pinna  of  Fig.  1,  X  3. 

Fig.  3.  Enlarged  pinnules  of  Fig.  1,  X  3. 
Figs.      4-8.  Ruffordia  G<epperti  (Dunk. )  Sew.  ? 75 

Fig.  5.  Enlargement  of  a  portion  of  Fig.  4,  to  show  tlie  .sori. 

Fig.  6.  Enlarged  pinnule  of  Fig.  4,  showing  one  sorus. 

Fig.  8.  Enlarged  portion  of  Fig.  7,  X  4. 
Figs.    9-11.  Adiantites  Nympiiarum  Heer? 76 

Fig.  10.  Enlarged  portion  of  Fig.  9,  X  2. 

Fig.  11.  Supposed  original  form  of  pinnule. 
Figs.  12-17.  T^eniopteris  orovillensis  Font 78 

Fig.  13.  Enlarged  portion  of  Fig.  12,  X  2. 

Fig.  17.  Enlarged  portion  of  Fig.  16,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII      PL.  XII 


JURASSIC    FERNS    FROM    OREGON. 


PLATE  XIII. 


PLATE    XIII. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.    1-3.  T.eniopteris  major  L.  &  H ^ _ 79 

Fig.  2.  Enlarged  portion  of  Fig.  1,  X  2. 
Figs.    4-8.  T.eniopteris  vittata  Brongn SO 

Fig.  8.  Enlarged  portion  of  Fig.  7,  X  2. 
Figs.  9, 10.  T.eniopteris?  oregonensis  Font.  n.  sp 82 

Fig.  10.  Enlarged  portion  of  Fig.  9,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


JURASSIC    FERNS    FROM    OREGON, 


PLATE    XIT 


PLATE    XIV. 

Jurassic  Flora  of  Oregon. 

Figs.    1-4.  Macrot.eniopteris  caufornica  Font.. 

Fig.  4.  Pen  drawing  of  a  portion  of  Fig.  3,  natural  sizo. 
Figs.  .5-11.  Sagenoptebis  Giepperti  Zigu 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XIV 


JURASSIC    FERNS    FROM    OREGON. 


PLATE  XV. 


PLATE    XV. 

Jurassic  Flora  of  Oregon. 

Page. 

Figs.  1-.3.  Sagenoptekis  PAUcrFOLiA  (Phill.)  Ward  ii.  coiiil) 8;j 

Figs.  4,  .'5.  Sagenopteris  grandipolia  Font.  n.  sp 87 

Fig.  5.  Pen  drawing  of  a  portion  of  Fig.  4,  natural  size. 
Figs.  6-9.  Dan^eopsis  Storrsii  Font.  n.  sp 87 

Fig.  7.  Enlarged  pinnule  of  Fig.  6,  X  2. 

Fig.  8.  Portion  of  same  still  further  enlarged  to  show  the  capsules,  X  3. 

Fig.  9.  Another  enlarged  pinnule,  showing  the  capsule  near  tlie  base,  X  2. 
Fig.     10.    Equisetum  ?  sp.  Font 88 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XV 


JURASSIC    FERNS    AND    EQUISETA    FROM     OREGON. 


PLATE  XVI. 


PLATE    XVI. 

Jurassic  Flora  of  Oregon. 


Figs.      1,2.  Ftii.ozamites  Leckenbvi  (Bean)  Nath 

Fig.  2.  Enlargement  of  Fig.  1,  X  2. 

Figs.      3-9.  Nilsonia  orientalis  Heer 

Fig.  8.  Portion  of  Fig.  7  enlarged,  X  2. 

Figs.  10-13.  Nilsonia  orientalis  minor  Font.  n.  var  . 
Fig.  11.  Summit  of  Fig.  10  enlarged,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII      PL.  XVI 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XVIL 


PLATE    XVII. 
Jurassic  Flora  of  Oregon. 

Page. 
1-7.  NiLSONiA  PARVULA  (Heer)  Font.  n.  comb- ^  -  -  -         92 

Fig.  5.  Enlarged  portion  of  Fig.  4,  X  3. 
Fig.  7.  Enlarged  portion  of  Fig.  6,  X  3. 

8-10.  NiLSONIA  NIPPONENSIS  Yok - 94 

Fig.  9.  Pen  drawing  of  a  portion  of  Fig.  8,  natural  size. 

11-14.  NiLSONIA  coMPTA  (Phill.)Gopp - 94 

Fig.  12.  Enlarged  portion  of  Fig.  11,  X  3. 


U.  S    GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XVll 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XVIII. 


PLATE    XVIII. 

Jurassic  Flora  of  Oregon. 

Pa?e. 
Figs.  1-6.  Nilsonia  pterophylloides  Nath , 90 

Fig.  3.  Enlarged  portion  of  Fig.  2,  X  2. 
Fig.  6.  Enlarged  pinna  of  Fig.  .5,  X  1- 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XVIII 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE   XIX. 


PLATE    XIX. 

Jurassic  Flora  of  Oregon. 

Page 
Figs.    1-6.  Ptekophvllum  Nathorsti  Schenk 97 

Fig.  3.  Enlarged  portion  of  Fig.  2,  X  2. 
FiG.s.  7-1 1 .  Pterophyllum  contighum  Schenk 99 

Fig.  8.  Enlarged  portion  of  Fig.  7,  X  2. 

Fig.  10.  Enlarged  portion  of  Fig.  9,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XIX 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XX. 


PLATE    XX. 

Jurassic  Flora  of  Oregon. 

Page. 

Figs.  1-7.  Pterophyli.um  .eqdale  (Brongn.)  Nath -  -       100 

Fig.  3.  Enlarged  portion  of  Fig.  2,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XX 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE   XXI. 


PLATE    XXI  . 

Jurassic  Flora  of  Oregon. 


Figs.  1-7.  Pterophyllum  ea.imahalense  Morr 

Fig.  2.  Enlarged  portion  of  Fig.  1,  X  2. 

Fig.  5.  Upper  part  of  Fig.  4,  enlarged,  X  2. 
Figs.  8, 9.  Pterophyllum  minus  Brongn.  ?. 

Fig.  9.  Upper  half  of  Fig.  8,  enlarged,  X  3. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXI 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XXII 


PLATE    XXII. 

Jurassic  Flora  of  Oregon. 

Page. 

Figs.  1-5.  Ctenopiiyllum  angustipolium  Font 105 

Fig.  3.  Enlarged  portion  of  Fig.  2,  X  S. 


U.  S.  GEOLOGICAL  SURVEV 


MONOGRAPH   XLVIll     PL.  XXII 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XXIII. 


PLATE    XXIII. 

Jurassic  Flora  of  Oregon. 

Page. 
Ctenophyllum  pachynerve  Font.  n.  sp 106 

Fig.  4.  Enlarged  portion  of  Fig.  3,  X  2. 
Ctenophyllum  Wardii  Font 107 

Figs.  6,  7.  Enlarged  portions  of  Fig.  5,  X  ii- 
Fig.  12.  Pen  drawing  of  Fig.  11,  natural  size. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVMI     PL.  XXIII 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XXIV. 


PLATE    XXIV. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.    1-10.  Podozamifes  pdi.chellus  Heer.. lOS 

Fig.  2.  Enlargement  of  Fig.  1,  X  2. 

Fig.  4.  Enlargement  of  Fig.  3,  X  f. 

Fig.  9.  Enlargement  of  Fig.  8,  X  2. 
Figs.  11-16.  Podozamites  pachyphyllus  Font.  n.  sp 109 

Fig.  15.  Enlargement  of  Fig.  14,  X  1- 
Figs.  17-20.  Podozamites  i.anceolatus  (L.  &  H.)  Fr.  Br 110 

Fig.  20.  Pen  drawing  of  Fig.  19,  natural  size. 


U.  S.  QEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXIV 


JURASSIC    CYCAPS    FROM     OREGON. 


PLATE   XXV. 


PLATE    XXV. 

JtTRAssic  Flora  of  Orkgon. 

Pa?c. 
Figs.  1—1.  Podoz\mites  lanceolati's  iiiiiior  (Sdn'iik)  lleer Ill 

Fig.  2.  Enlargement  of  Fig.  1,  X  ji. 

Fig.  4.  Enlargement  of  Fig.  3,  X  2. 
Figs.  .5-7.  Podozamites  lanceolatus  latifoliu.s  (Fr.  Br. )  Heer 112 

Fig.  6.  Enlargement  of  Fig.  5,  X  S- 

Fig.        S.  Pouozamite.s  ?  paciitnervis  Font.  n.  sp 112 

Fig.        9.  Ctenis  sl  lcigali.is  (Pliill.)  Ward  n.  comb 113 


U.  S.  GEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXV 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE   XXVI. 


PLATE    XX VI  . 

JtjRAssic  Flora  of  Oregon. 


'"iGS.  1-5.  Ctenis  .<iri.ciCAUi,is  (Phill.)  Ward  n.coiiib. 
Fig.  2.   Enlargement  ol' Fig.  1,  X  i. 
Fig.  6.  Enlargement  of  Fig.  5,  X  3. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVMI     PL.  XXVI 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE   XXVII. 


PLATE    XXVII. 

Jurassic  Flora  of  Oregon. 

Figs,  l-.'i.  Ctenis  orovii.lensis  Font 

Fig.  2.  Fragment  of  a  leaflet  of  Fig.  1,  natural  .size. 
Fig.  4.  Pen  drawing  of  Fig.  3,  natural  size. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXVII 


JURASSIC    CYCADS    FROM    OREGON. 


PLATE  XXVIII. 


PLATE    XXVIII. 

Jurassic  Flora  of  Orecon. 

Fig.        1.  CiENis  ohovii.le.nsis  Font — US 

Figs.  2-S.  Ctenls  (M!andifoli.\  Font 116 

Fig.  A.  Portion  of  Fig.  3  showing  nervation,  natural  size. 

Fig.  6.  Basal  part  of  Fig.  5,  natural  size. 

Fig.  8.  Pen  drawing  of  Fig.  7  better  to  show  the  nervation,  natural  size. 


U.  S.  QEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXVIII 


JURASSIC    CYCADS    FROM     OREGON. 


PLATE  XXIX. 


PLATE    XXIX. 

Jurassic  Flora  of  Oregon. 

Page. 

Fig.            1.  Ctenis  alricllata  Font.  >. 117 

Ficis.      2,  3.  Encephalartopsis  '.  oregonensis  Font.  n.  sp 117 

Fig.  3.  Pen  drawing  of  Fig.  2. 

Fig.           4.  Cycadeospermum  okegonense  Font.  n.  sp IIS 

Fig.            5.  Cycadeospermum  ovatum  Font.  n.  sp '. IIS 

Fig.            6.  Williamsonia  oregonensis  Font.  n.  sp IIS 

Fig.           7.  Williamsonia  ?  sp.  Font.  (Bract,  No.  1) 119 

Figs.      8,9.  Williamsonia  ?  sp.  Font.  (Bract,  No.  2a) 119 

Fig.  9.  Enlargement  of  Fig.  8,  X  2. 

Fic.          10.  Williamsonia  ?  sp.  Font.  (Bract,  No.  2b) 119 

Figs.  11,12.  Williamsonia  ?  sp.  Font.  (Bract,  No.  2c) 119 

Fig.  12.  Enlargement  of  Fig.  11,  X  2. 


U.  S.  QEOLOQICAL  SURVEY 


MONOQRAPH    XLVIII      PL.  XXIX 


JURASSIC    CYCADS    AND    WILLIAMSONIAS    FROM    OREGON. 


PLATE   XXX. 


PLATE    XXX. 

Jurassic  Flora  of  Oregon. 


Figs.    1-7.  Ginkho  niGiiATA  (Brongii.)  Heer . 

Fig.  2.  Pen  drawing  of  part  of  Fig.  1  to  sliow  norviition,  natural  size. 

Fig.  5.  Pen  drawing  of  Fig.  4,  natural  size. 

Fig.  7.  Pen  drawing  of  Fig.  6,  natural  size. 
Figs.  8-12.  GrNKGO  Huttoni  (Sternb.)  Heer 

Fig.  9.  Pen  drawing  of  Fig.  8,  natural  size. 

Fig.  11.  Pen  drawing  of  Fig.  10,  natural  size. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXX 


JURASSIC    GINGKOS    FROM    OREGON. 


PLATE  XXXI. 


PLATE    XXXI. 
Jurassic  Flora  of  Oregon. 

Page. 
Figs.  1-3.  Ginkgo  Huttoni  (Sternb.)  Heer 123 

Fig.  3.  Pen  drawing  of  Fig.  2,  natural  size. 

Figs.  4-8.  Ginkgo  Huttoni  Magnifolia  Font.  n.  var 124 

Fig.  .5.  Pen  drawing  of  a  portion  of  Fig.  4,  natural  size. 
Fig.  7.  Pen  drawing  of  a  portion  of  Fig.  6,  natural  size. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXI 


JURASSIC    GINGKOS    FROM    OREGON. 


PLATE  XXXII. 


PLATE    XXXII. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.  1,  2.  Ginkgo  Huttoni  magnifolia  Font.  n.  var 124 

Fig.  2.  Pen  drawing  of  Fig.  1,  natural  size. 
Figs.  3-S.  Ginkgo  lepida  Heer 125 

Fig.  4.  Pen  drawing  of  Fig.  3,  natural  size. 

Fig.  7.  Enlargement  of  Fig.  6,  X  |. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXII 


JURASSIC    GINGKOS    FROM    OREGON. 


PLATE  XXXIII. 


PLATEXXXIII. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.  1-19.  Ginkgo  sibiriga  Heer 125 

Fig.  4.  Enlargement  of  Fig.  3,  X  S. 
Fig.  6.  Enlargement  of  Fig.  5,  X  f. 
Fig.  10.  Enlargement  of  Fig.  9,  X  |. 
Fig.  13.  Enlargement  of  Fig.  12,  X  2. 
Fig.  1.5.  Enlargement  of  Fig.  14,  X  2. 
Fig.  17.  Enlargement  of  Fig.  16,  X  2. 
Fig.  19.  Enlargement  of  Fig.  IS,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXIII 


JURASSIC    GINGKOS    FROM    OREGON. 


PLATE   XXXIV. 


PLATE    XXXIV. 

Jurassic  Flora  of  Oregon. 

Pasre. 

Figs.  1-12.  Ginkgo  sp.  Font.,  aberrant  forms  of  leaves 127 

Fig.  2.  Enlargement  of  Fig.  1 ,  X  2. 
Fig.  4.  Enlargement  of  Fig.  3,  X  2. 
Fig.  6.  Enlargement  of  Fig.  5,  X  2. 
Fig.  8.  Enlargement  of  Fig.  7,  X  2. 
Fig.  10.  Enlargement  of  Fig.  9,  X  2. 
Fig.  12.  Enlargement  of  Fig.  11,  X  2. 

Figs.  13,14.  Pikenicopsis  ?  sp.  Font ' 128 

Fig.  14.  Pen  drawing  of  Fig.  13,  natural  size. 

■  Figs.  1.5-17.  Taxites  zamioides  (Leek.)  Sew ...       129 

Fig.  1(3.  Enlargement  of  Fig.  15. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXIV 


JURASSIC    GINGKOACE^E    AND    TAXACE/€    FROM    OREGON. 


PLATE   XXXV. 


PLATE    XXXV. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.      1-3.  Taxite.s  za.mioides  (Leek.)  Sew - - 129 

Fig.  2.  Enlargement  of  part  of  Fig.  1,  X  3. 
Figs.      4-8.  Brachvphyllum  mamillare  Brongn .-. 130 

Fig.  5.  Enlarged  portion  of  Fig.  4,  X  2. 

Fig.  7.  Enlargement  of  Fig.  6,  X  2. 

Fig.  9.  .\kaucarites  ?  sp.  Font,  (cone  scale) -  -       131 

FiG.s.  10-17.  PiNL's  NoRDENSKioLDi  Hcer. - - -  - 131 

Fig.  11.  Pen  drawing  of  Fig.  10,  natural  size. 

Fig.  13.  Pen  drawing  of  Fig.  12,  natural  size. 

Fig.  1.5.  Pen  drawing  of  one  of  the  leaves  shown  in  Fig.  14,  natural  size. 

Fig.  17.  Pen  drawing  of  Fig.  16,  natural  size. 


U.  S.  QEOLOQIGAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXV 


JURASSIC    CONIFERS    FROM    OREGON. 


PLATE   XXXVI 


PLATE    XXXVI. 

Jurassic  Flora  of  Oregon. 

Page. 
Figs.  1,  2.  Cyclopitys  oregonensis  Font.  n.  sp 132 

Fig.  2.  Enlargement  of  Fig.  1,  X  S. 
Figs.   3-8.  Sphenolepidium  oregonense  Font.  n.  sp _ 133 

Fig.  4.  Enlargement  of  Fig.  3,  X  2. 

Fig.  7.  Enlargement  of  the  principal  branch  shown  in  Fig.  6,  X  2. 

Fig.  8.  Enlargement  of  the  cone  and  twig  to  which  attached  sho%vn  in  Fig.  6,  X  2. 
Figs.  9-12.  Samaropsis  ?  oregonensis  Font.  n.  sp , 134 

Fig.  10.  Enlargement  of  Fig.  9,  X  3. 

Fig.  12.  Enlargement  of  Fig.  11,  X  3. 
FiQ.        13.  Male  ament  of  conifer 135 


U.  S,  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXVI 


JURASSIC    CONIFERS    FROM    OREGON. 


PLATE   XXXVII. 


PLATE    XXXVII. 

Jurassic  Flora  of  Oregon. 

Page. 

Figs.      1,2.  Yuccites  hettangensis  Sap.  ? 135 

Fig.  2.  Pen  drawing  of  a  portion  of  Fig.  1,  natural  size. 

Figs.      3, 4.  Undetermined  leaf,  No.  1 136 

Fig.  4.  Pen  drawing  of  one  of  the  leaves  of  Fig.  3,  natural  size. 

Figs.      5,  6.  Undetermined  leaf,  No.  2 136 

Fig.  6.  Pen  drawing  of  a  portion  of  Fig.  .5,  natural  size. 

Figs.      7,  8.  Cakpolithus  olallensis  Ward  n.  sp 137 

Fig.  9.  Carpolithus  Bucklandii  Willn.  ? 138 

Figs.  10, 11.  Carpolithus  OREGONENeis  Font.  n.  sp .  139 

Fig.  12.  Carpolithus  elongatus  Font.  n.  sp 139 

Fig.  13.  Carpolithus  douglasensis  Font.  n.  sp 139 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXVII 


MISCELLANEOUS  JURASSIC    PLANTS    FROM    OREGON. 


PLATE  XXXVIII. 


PLATE    XXXVIII. 

Jurasso-Cretaceous  Floras. 

Page. 
Figs.      1 , 2.  Dicksoxia  oregonensis  Font.  ? 148 

Fig.  2.  Enlargement  of  Fig.  1,  X  2. 
Figs.      3,  4.  Thyrsopteris  Murrayak.4  (Brongn.)  Heer  ? 148 

Fig.  4.  Enlargement  of  Fig.  3. 
Figs.      5,  6.  Cladophlebis  vaccensis  Ward 149 

Fig.  6.  Enlargement  of  Fig.  5,  X  2. 
Figs.      7,8.  Ctexis  sulcicaulis  (Phill.)  Ward  ? 149 

Fig.  8.  Enlargement  of  Fig.  7,  X  3. 
Figs.    9, 10.  Ctenopiiylluji  ?  sp.  Font.  n.  sp.  ? 149 

Fig.  10.  Enlargement  of  Fig.  9. 
Figs.  11, 12.  Podozamites  lanceolatus  minor  (Schenk)  Heer  ? ISO 

Fig.  12.  Enlargement  of  Fig.  11. 

Figs.  13,14.  Otozamites  orego.mensis  Font.  n.  sp 150 

Figs.  1.5-18.  Taxites  zamioides  (Leek.)  Sew 151 

Fig.  16.  Enlargement  of  Fig.  15,  X  2. 

Fig.  18.  Enlargement  of  Fig.  17,  X  2. 
Figs.  19,20.  Pterophyllum  alaskense  Font.  n.  sp 152 

Fig.  20.  Portion  of  Fig.  19,  enlarged,  X  2. 
Fig.  21.  Sagenopteris  alaskensis  Font.  n.  sp -  - 152 


U.  S.  QEOLOQICAL  SURVEV 


MONOGRAPH   XLVIII     PL.  XXXVIII 


JURASSO-CRETACEOUS    PLANTS    FROM    OREGON    AND    ALASKA. 


PLATE   XXXIX. 


PLATE    XXXIX. 

Jurasso-Cretaceous  Flora  of  Cape  Lisburne,  Alaska. 

Page. 
Figs.    1,2    Dicksonia  Saportana  Heer 15.5 

Fig.  2.  Enlarged  portion  of  Fig.  1,  X  3. 
Figs.    3-6    Onychiopsis  psilotoides  (Stokes  &  Welib)  Ward  n.  comb 1.55 

Fig.  4.  Enlarged  portion  of  Fig.  3,  X  3. 

Fig.  6.  Enlarged  pinnule  of  Fig.  5,  X  3. 
Figs.    7,  8.  Ci.adophlebis  vaccensis  Ward 157 

Fig.  8.  Enlarged  portion  of  Fig.  7,  X  3. 
Figs.  9-11.  Cladophlebis  alata  Font 158 

Fig.  10.  Enlarged  portion  of  Fig.  9.  X  3. 

Fig.  11.  Two  pinnules  of  Fig.  9,  enlarged  to  .show  the  teeth,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XXXIX 


JURASSO-CRETACEOUS    FERNS    FROM    CAPE    LISBURNE,    ALASKA. 


PLATE   XL. 


PLATE    XL. 

Jurasso-Cretaceous  Flora  of  Cape  Lisburne,  Alaska. 

Page. 
Figs.  1-9.  Cladophlebis  al.ata  Font 158 

Fig.  2.  Enlarged  portion  of  Fig.  1,  X  2. 
Fig.  4.  Enlarged  portion  of  Fig.  3,  X  2. 
Fig.  6.  Enlarged  portion  of  Fig.  5,  X  3. 
Figs.  8, 9.  Enlarged  pinnules  of  Fig.  7,  X  2. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XL 


JURASSO-CRETACEOUS    FERNS    FROM     CAPE    LISBURNE,    ALASKA. 


PLATE  XLI. 


P  L  A  T  E    X  L  I  . 

Jurasso-Cretaceous  Flora  of  Cape  Lisburne,  Alaska. 

Faee. 

Ci,Aunpiii,EBi!S  HuTTONi  (Duiik.)  Foiit.  n.  comb -  -       161 

Fig.  2.   Portion  of  Fig.  1  enlarged,  X  i- 

Fig.  3.  Pinnule  of  Fig.  1  enlarged,  X  2. 

F'ig.  -J.   Pinnule  of  Fig.  1  enlarged  and  restored  X  -3. 

Fig.  Ft.  Portion  of  Fig.  1  enlarged  and  restored  Xi- 


PLATE   XLII. 


PLATE    X  L  T  I  . 

,lui!Ass()-Ci!KrAci:()i's  Floka  of  Capk  IjISburnr,  Alaska. 

Hiiee. 

Pkis.  1-3    Ci.AiiciiMii. Kills   lli'iToNi  ( 1  )unU. )  I' i"it  ■  H- coiiili  Kil 

Kifl.  2.  ICiiliirficd  pinmilc  of  Kig.  1,  X  2. 

Fig.  3.  Portion  of  Fig.  1  onliiiged  and  restoied,  X  3. 


U.  S.  GEOLOGICAL  SURVE 


MONOGRAPH   XLVIII     PL.  XLII 


JURASSO-CRETACEOUS    FERNS    FROM    CAPE    LISBURNE,    ALASKA. 


PLATE    XLIII. 


PLATE    XLIII. 

Jurasso-Cretaceous  Flora  of  Cape  Lisburne,  Alaska. 

Pape. 

Fios.  1-7.  Ci..4DOPHLBBis  HuTTONi  (Dunk.)  Font.  a.  comb 161 

Fig.  2.  Portion  of  Fig.  1  enlarged,  X  2. 

Fig.  3.  Pinnule  of  Fig.  1  restored  and  slightly  enlarged. 

Fig.  5.  Enlarged  pinnule  of  Fig.  4,  X  2. 

Fig.  6.   Pinnule  of  F^ig.  4  restored  and  slightly  enlarged. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLIII 


JURASSO-CRETACEOUS    FERNS    FROM    CAPE    LISBURNE,    ALASKA. 


PLATE   XLIY 


PLATE    XLIV. 

Jurasso-Cretaceous  Flora  of  Cape  Lisburne,  Alaska. 

Page. 

Fig.        1.  PoDozAMiTEs  GRANDiFOi.ius  Font.  ? 167 

Fig.        2.  Baiera  gracilis  (Bean)  Bunb. 168 

Figs.  3,  4.  Ginkgodium  ?  alaskense  Font.  n.  sp 168 

Fig.  4.  Outline  sketch  of  Fig.  3  showing  tlie  plan  of  neivation,  natural  size. 

Figs.  5,  6.  Ginkgo  digitata  (Brongn.)  Heer 170 

Figs.  7,  8.  Ginkgo  Huttoni  magnifolia  Font.  'L 170 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLIV 


JURASSO-CRETACEOUS    CYCADS    AND    GINGKOACE/E    FROM     GAPE    LISBURNE,    ALASKA. 


PLATE    XLV. 


PLATE    XLV. 

Jurasso-Cretaceous-  Flora  of  Alaska,  Montana,  anu  California. 

Page. 

Figs.     1-5.  Nageiop.sis  i.ongifoi.i.\  Font.  ?  from  the  Jurasso-Cretaceous  of  Cape  Lisbunie,.\laska 171 

Fig.  4.  Enlarged  portion  of  Fig  3,  X  3. 

Fig.  6.  BKACUYPiiyLLUM  ?  Storrsii  AVard  n.  sp 176 

Figs.    7,8.  Sequoia   Reichenbachi  (Gein.)  Heer  from   the  Jurassic   or  Lower  Cretaceous  of   Mon- 
tana  - - - 177 

Fig.  8.  Enlarged  portion  of  Fig.  7. 
Figs.  9-11.  Sequoia   Fairbanksi    Font.  n.  sp.  from  the  Juras.so-Cretaceous  of  Slate  Spring-'^,  Cali- 
fornia  - - - — 178 


U.  S.  QEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLV 


JURASSO-CRETACEOUS    CONIFERS    FROM    ALASKA,    MONTANA,    AND    CALIFORNIA. 


PLATE  XL VI. 


PLATE    XLVI. 

JcRASsic  Cycads  from  THE  Freezeout  Hills,  Wyoming. 

Page. 
CycADELLA  WYOMiNGENSis  Ward 183 

View  of  one  side  and  part  of  the  base  of  the  trunk  consisting  of  Nos.  500.88,  500.513,  and  500.525 
of  tlie  museum  of  the  University  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLVI 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE    XLVII. 


PLATE    XL  VII. 

Jurassic  Ctcads  from  the  Freezeout  Hills,  Wyoming. 

Page. 

Figs.  1,  2.  Cycadell.\  Knowltoniana  Ward 1S5 

Side  views  of  the  fragments  Nos.  .500.9-1  and  500.498,  respectively,  of  the  museum  of  the 
Univei-sity  of  Wyoming. 

Fig.        3.  Cycadella  Reedii  Ward 182 

Side  view  of  the  small  trunk  No.  100.239  of  the  museum  of  the  University  of  Wyoming. 

Fig.        4.  Cycadella  compressa  Ward 186 

Side  and  top  view  of  the  small  trunk  No.  100.264  of  the  museum  of  the  University  of 
Wyoming. 


PLM^E   XLVIIL 


PLATE    XLVIII. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 

Cycadella  compressa  Ward 1S6 

Fig.  1.  Side  and  top  view  of  the  small  trunk  No.  .500.503  of  the  museum  of  the  University  of 

Wyoming. 
Fig.  2.  Side  view  of  the  small  trunk  No.  100.22S  of  the  museum  of  the  Univereity  of  Wj-oniing. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLVIII 


CENTIMETERS  I 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   XLIX. 


PLATE    XLIX. 

JlTRASSIC    CyCADS    FROM    THE    FrEEZEOUT    HiLLS,  WyOMIXG. 

Page. 

Cycadella  JIRASSICA  Ward _. 1S6 

View  of  the  surface  of  the  segment  resulting  from  the  union  of  the  fragments  Nos.  100.2(M  and 
500.507  of  the  museum  of  the  Unirersity  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XLIX 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   L. 


PLATE    L. 

Jurassic  Cycads  from  the  Feeezeout  Hills,  Wyoming. 

Pago 

Cycadella  nodosa  Ward 187 

Side  view  of  the  trunk  No.  500.509  of  the  museum  of  the  University  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  L 


i..^'>   -^^ 


A^. 


/^'^^  I 


AJ' 


CENTIMETERSI 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LL 


PLATE    LI. 
Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadella  nodosa  Ward - - 18" 

Side  \-ipw  showing  also  part  of  the  base  of  the  trunk  No.  lOU.L'Ob  of  the  museum  of  tlie  University 
of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LI 


CENTIMETERS  I 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE  LII. 


P  L  A  T  E    L  1 1  . 
Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Flo.        1 .  Ctcadella  nodosa  Ward. 187 

Side  view  of  the  small  trunk  No.  100.229  of  the  museum  of  the  University  of  Wyoming. 
Fius.  2-4.  Cycadella  cirrata  Ward.. 188 

Fig.  2.  Side  view  of  the  triangular  section  resulting  from  joining  Nos.  .500.178  and  .500.422 

of  the  museum  of  the  University  of  Wyoming. 
Figs.  3,  4.  Views  of  the  internal  structure  shown  in  the  fractures  of  Nos.  500.422  and 

500.136,  respectively,  of  the  museum  of  the  University  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII      PL.   Lll 


JURASSIC    CYCAD8    FROM    WYOMING. 


PLATE   LIII. 


PLATE    LIII. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
CvcADELLA   ciRRATA  Ward _ ] S8 

View  of  the  internal  structure  shown  in  the  tangential  fracture  of  the  fragment  No.  100.245  of  the 
museum  of  the  University  of  Wyoming. 


PLATE   LIT. 


PLATE    LIV. 
Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadella  exogena  Ward 1S9 

Fh;.  1.  View  of  the  tangential  fracture  of  the  trunk  No.  .500..514  of  the  museum  of  the  University 
of  Wyoming. 

Figs.  2,  3.  Views  of  the  radial  fractures  of  the  two  fragments  Nos.  .500.41(3  and  .500.174,  respec- 
tively, of  the  museum  of  the  Univei-sity  of  Wyoming,  showing  the  cxogenou.s  struc- 
ture and  woodv  wedges. 


PLATE   LV. 


PLATE    LV. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadella  ramentosa  Ward - 191 

Fig.  1.  Side  view  of  the  trunli  No.  100.214  of  the  museum  of  the  University  of  Wyoming. 
Fig.  2.  'S'iew  of  the  rough  radial  fracture  of  the  fragment  No.  100.201  of  the  museum  of  tlie  Uni- 
vei'sitv  of  Wvoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIll     PL.  LV 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE    LVI. 


PLATE    L  V  I  . 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadella  contracta  \Tard. 192 

Fig.         1.  Side  view  of  the  imperfect   trunk  No.   100.218  of  tlie  museum  of  the  University  of 

W\'omii)g. 
Figs.  2,  3.  Views  of  the  outer  and  inner  surfaces,  respectively,  of  tlie  small  trunk  Nu.  1(X1.241  of 

the  museum  of  tlie  University  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII      PL.  LVI 


I  CENTIMETERS  I 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LTII. 


PLATE    LVII. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

CiCADELLA  JEJUNA  Ward - 194 

Side  view  of  the  trunk  consisting  of  Nos.  .500.5L5  and  500.491  of  the  museum  of  the  Universitj'  of 
Wyoming. 


PLATE    LVIII. 


PLATE    LVIII. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadella  CREPiDAEiA  Ward - 195 

View  of  the  best  presei-ved  side  of  die  tiunl:,  consisting  of  Nos.  100.202,  100.215  and  100.230  of 
the  museum  of  the  University  of  Wyoming. 


U.  S.  GEOLOQIOAL  SURVEY 


Monograph  xlvim    pl.  lviI 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LIX. 


PLATE    LIX. 
Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadeli.a  crepidaria  Ward -  - 195 

\'ie\v  tif  one  side  of  tlie  trunk  No.  100.203  of  the  jiuiseum  of  the  Univei-sity  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII      PL.  LIX 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE    LX. 


PLATE    LX. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Cycadei.i.a  crepidaria  Ward 195 

View  of  the  convex  side  of  tlie  trunk  Xo.  100.226  of  the  museum  of  tlie  University  of  Wyoming 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII      PL.  LX 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LXI. 


PLATE    LXI. 

Jurassic  Cycads  from  the  Freezeout  Hills,  Wyoming. 

Page 
Cycadei.la  Knightii  Ward 197 

View  of  the  convex  side  of  the  trunk  No.  500.6S7  of  the  museum  of  the  University  of  Wyoming. 


U.  S.  GEOLOGICAL  SURVE 


MONOGRAPH    XLVIII      PL.  LXI 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LXII. 


PLATE    LXII. 

Jurassic  Oycads  from  the  Freezeout  Hills,  Wyoming. 

Page. 
Figs.  1-3.  Cycadella  ramentosa  Ward 191,200,201,202,203 

Fig.  1.  Hypothetical  form  of  irond. 

Fig.  2.  Transverse  section  of  young  frond,  X  25. 

Fig.  3.  Transvei-se  section  of  ramental  eliafl',  X  6.5. 
Fig.        4.  Wii.i.iamsonia  gigas  (L.  &  H.)  Carr.  (introduced  for  comparison). . 201,204 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXII 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE   LXIII. 


PLATE    LXIII. 

Jurassic  Cycads  from  Wyoming. 

Page. 

Fig.  1.  Cycadella  kamentosa  Ward 200, 201 ,  202 

Trans veree  section  of  young  frond,  X  25. 
Fig.  2.  Cycadella  utopiensis  Ward. 204 


U.  S.  GEOLOGICAL  SU«VEY 


MONOGRAPH   XLVIII     PL.  LXIII 


JURASSIC    CYCADS    FROM    WYOMING. 


PLATE  LXIV. 


PLATE    LXIV. 

Page. 
Sketch  map  of  the  Shasta  foruiatiou  of  CaUfomia  yieldiug  fossil  plauts - 221 


U.    S.   GEOLOGICAL      SURVEY 


MONOGRAPH     XLVin     PL.  LXIV 


SKETCH  MAP  SHOWING-  FOSSIL  LOCALITIES  OF  THE  SHASTA  FORMATION 

NORTHERN  CALIFORNIA 
Scale 


PLATE  LXT. 


PLATE    LXV. 

Flora  of  the  Shasta  Formation. 

Page. 

FlC.  1  .    DiCKSONIA    PACIIVPHYLLA    Foilt.  11.  sp 224 

Figs.      2-4.  Thvrsopteris  rarinervis  Font,  t 22.5 

Figs.      .5-8.  Cladophlebis  parva  Font •. 1 22.5 

Figs.    9-11.  Cladophlebis  Browniana  (Dunk. )  Sew _ 226 

Figs.  12-14.  Cladophlebis  falcata  Font 227 

Figs.  15, 16.  Cladophlebis  Ungeri  (Dunk. )  Ward  n.  comb 228 

Figs.  17-21.  Cladophlebis  alata  Font.  '. .  229 

Figs.  22,23.  Matonidium  Althausii  (Dunk.)  Ward 230 

Figs.  24-29.  Gleichenia  Nokdenskioldi  Heer 231 

Figs.  .30-3.5.  Sagenopteris  Mantelli  (Dunk.)  Schenk 233 

Figs.  36-38.  Sagenopteris  orbgonbnsis  Font.  n.  roiub 23.5 

Figs.  39,  40.  Sagenopteris  elliptica  Font 236 

Figs.  41-45.  S.-vgenopteris  nervosa  Font,  n.sp 237 

Fig.  4G.  Sagenopteris  ?  sp.  Font 238 

Flu.  47.  IIausmannia  '(  californica  Font,  n.sp -  23S 


U.  S.  QEOLOQIOAL  SURVEY 


MONOGRAPH    XLVIII      PL.  LXV 


FERNS    FROM    THE    SHASTA    FORMATION    OF    CALIFORNIA    AND    OREGON. 


PLATE  LXVI. 


PLATE    LXVI. 
Flora  of  the  Shasta  Formation. 

Page. 

Figs.      1-4.  Angiopteridium  canmorense  Dn.  ?.. -. 239 

Figs.      5-7.  Angiopteridium  strictinerve  Font 240 

Figs.    8-10.  Angiopteridium  strictinerve  latifolium  Font 241 

Fig.          11.  Gleichenia  ?  Gii.bert-Thompsoni  Font.  n.  sp 232 

Figs.  12, 13.  Ctenopteris  integrifolia  Font - 242 

Fig.  13.  Enlargement  of  Fig.  12. 

Fig.          14.  Eqdisetum  texense  Font.  ?. - 243 

Fig.          15.  Dioonites  Dunkerianus  (Gopp.)  Miq .-. -  -  243 

Figs.  16, 17.  Dioonites  Buchianus  (Ett.)  Born -  -  244 


U.  S.  QEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXVI 


FERNS    FROM    THE    SHASTA    FORMATION    OF    CALIFORNIA    AND    OREGON. 


PLATE   LXVII. 


PLATE    LXVII. 

Flora  of  the  Shasta  Formation. 

Page. 

Figs.  1-3.  Dioonites  Buchianus  abietinus  (Gijpp. )  Ward  n.  comb 250 

Fig.        4.  Dioonites  Buchianus  rarinervis  Font.  ? 251 

Figs.  5, 6.  Nii.sonia  Stantoni  Ward  n.  sp 251 

Fig.        7.  Nilsonia  californica  Font -. 252 

Fig.        8.  Nilsonia  sambucensis  Ward  n.  sp 254 

Fig.        9.  Pterophyllum  ?  lowryanum  Ward  n.  sp 254 

Fig.      10.  Ctenophyllom  latifolium  Font.  ? 255 


U.  S.  GEOLOGICAL  SURVEY 


MONOGPAPH   XLVIII     PL.  LXVII 


CYCADS    FROM    THE    SHASTA    FORMATION    OF    CALIFORNIA    AND    OREGON. 


PLATE  LXVIII. 


PLATE    LXVIII. 

Flora  of  the  Shasta  Formation. 

Page. 

Fig.           1 .  Zamites  arcticus  Gopp 256 

Figs.      2,3.  Zamites  tenuinervis  Font 257 

Fig.           4.  Cycadeospermum  californicum  Font.  n.  sp 257 

Figs.      5-7.  Cephalotaxopsis  ramosa  Font.  ? 258 

Fig.           8.  Cephalotaxopsis  rhttidodes  ?  Ward  n.  sp 258 

Figs.    9-12.  Nageiopsis  longifolia  Font.  ?. 259 

Fig.          13.  Nageiopsis  latifolia  Font.  ? 260 

Fig.         14.  Abietites  ellipticus  Font 260 

Figs.  15, 16.  Abietites  macrocarpus  Font - 261 

Fig.          17.  Abietites  *  sp.  Font,  (immature  cone) 262 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII      PL.  LXVIll 


CYCADS    AND    CONIFERS    FROM    THE    SHASTA    FORMATION    OF    CALIFORNIA    AND    OREGON. 


PLATE  LXIX. 


PLATE    LXIX. 

Flora  of  the  Shasta  Formation. 

Page. 

Figs.      1-3.  Pinus  shastbnsis  Font.  n.  sp 262 

Figs.      4,  S.  Sequoia  Reichenbachi  (Gein. )     Heer 263 

Fig.           6.  Sequoia  ambigua  Heer 264 

Fig.           7.  Sphenolepidium  Sternbergianum  (Dunk. )    Heer 264 

Fig.           S.  Saliciphyllum  pachyphyllum  Font.  n.  sp. 265 

Fig.           9.  Saliciphyllum  californicum  Font.  n.  sp 266 

Fig.          10.  POPULUS  ?  RiCEi  Font.  n.  sp 266 

Fig.          11.  Prote^phyllum  californicum  Font.  n.  sp 267 

Figs.  12-14.  Menispermites  californicus  Font.  n.  sp 268 

Figs.  15-17.  Sapindopsis  oregonensis  Font.  n.  sp 26S 

Fig.          18.  AcAciiEPHYLLUM  ELLiPTicuM  Font.  n.  sp 269 

Fig.          19.  Acaci.!ephyllum  pachyphyllum  Font.  n.  sp 270 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXIX 


r 

i 


CONIFERS  AND    DICOTYLEDONS    FROM    THE    SHASTA   FORMATION    OF    CALIFORNIA  AND    OREGON. 


PLATE  LXX. 


PLATE    LXX. 

Flora  of  the  Shasta  Formation. 

Vase. 
Cycadeoidea  Stantoni  Ward  n.  sp 276 

View  of  the  best  preserved  side. 


PLATE    LXXI 


PLATE    LXXI. 

Flora  of  the  Kootanie  Formation. 

Page 
Figs.      1—4.  Dicksonia  montanensis  Font.  n.  sp 286 

Fig.  2.  Enlarged  pinnule  of  Fig.  1,  X  2. 

Fig.  4.  Enlarged  pinnule  of  Fig.  3,  X  2. 
Figs.    5-11.  Dicksonia  pachyphylla  Font 288 

Fig.  6.  Portion  of  Fig.  5  enlarged,  X  4. 

Fig.  8.  Enlargement  of  Fig.  7,  X  2. 

Fig.  10.  Portion  of  Fig.  9  enlarged,  X  3. 

Figs.  12, 13.  Thyrsopteris  elliptica  Font .~. 290 

Figs.  14-20.  Cladophlebis  falcata  montanensis  Font.  n.  comb 291 

Fig.  16.  Portion  of  Fig.  15  enlarged,  X  2. 

Fig.  18.  Pinnule  of  Fig.  17  enlarged,  X  2. 
Figs.  21-25.  Cladophlebis  iieterophylla  Font 294 

Fig.  22.  Pinnules  of  Fig.  21  enlarged,  X  2. 
Fig.         26.  Cladophlebis  constricta  Font.  ? 297 


U.  S.  GEOLoaiCAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXI 


FERNS    FROM    THE    KOOTANIE    FORMATION     OF    MONTANA. 


PLATE   LXXII. 


PLATE    LXXII. 

Flora  of  the  Kootanie  Formation. 

Page. 
Fi(;s.    1-11.  Eqcisetlm  Phillipsii  (DunU. )  Brongn. 29S 

Fig.  9.  Portion  of  Fig.  S  enlarged,  X  2. 

Fig.  10.  Portion  of  Fig.  S  enlarged,  X  3  and  restored. 
Figs.  12-14.  Equisetum  Lvellii  Mant 301 

Fig.  1-4.  Portion  of  Fig.  13  enlarged,  X  3  and  restored. 
Fi(;s.  1.5. 16.  Lycopodites  ?  .mont.\nensis  Font.  n.sp,. Z02 

Fig.  IG.  Portion  of  Fig.  1.5  enlarged,  X  2. 
Fios.  17-21,  NiLSONiA  ScHAUMBURGENSis  (Dunk.)  Natli 303 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXll 


/>,x 


EQUISETA    AND    CYCADS    FROM     THE    KOOTANIE    FORMATION     OF    MONTANA. 


PLATE   LXXIII. 


PLATE    LXXIII. 

Flora  of  the  Kootanie  Formation. 

Page 

Figs.      1-6.  Za.mites  arcticus  Gopp SOU 

Fig.  6.  Portion  of  Fig.  5  enlarged,  X  4. 

Fig.  7.  Cycadeospermum  montanense  Font.  n.  sp 310 

Fig.  8.  Cephalotaxopsis  eamosa  Font.  ? 31 1 

Fig.  9.  Nageiopsis  i.ongifolia  Font 311 

Fig.  10.  Nageiopsis  montanensis  Font.  n.  sp 312 

Figs.  11-14.  Laricopsis  longifolia  l.atifolia  Font.  n.  var 312 

Flora  of  the  Lakota  Formation. 

Fic!.  15.  (a-c).   NiLsoNiA  nigracollen'sis  Wielaiid  n.  sp 319 

Fig         1.5d.  Thyrsopteris  dentifolia  Font 320 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXIII 


CYCADS  AND  CONIFERS  FROM  THE  KOOTANIE  FORMATION  OF  MONTANA  AND  THE  LAKOTA 
FORMATION  OF  SOUTH  DAKOTA. 


PLATE   LXXIV. 


PLATE    LXXIV. 

Page. 
View  of  exposure  on  Ontario  avenue,  in  rear  of  Lanier  Heights,  Washington,  D.  C,  looking  north,  show- 
ing the  Rappahannock  sands  of  the  Potomac  formation  resting  on  the  crystalline  rocks.     From  a 
photograph  hy  the  United  States  Geological  Survey,  1S92 3S2 


PLATE   LXXV 


PLATE    LXXV. 

Page. 
Exposure  ou  Kansas  avenue,  between  the  Adams  Mill  road  and  Ontario  avenue,  Washington,  D.  C, 
looking  east,  showing  the  Potomac  formation  overlain  by  the  Columbia  bowlder  clay.     From  a  pho- 
tograph by  the  United  States  Geological  Survey,  1892 382 


PLATE    LXXVI. 


PLATE    LXXVI. 

Page. 
Exposure  on  Sixteentli  street,  opposite  Crescent  street,  Washington,  D   C,  looking  northeast,  showing 

hasiil  lA)loiniU'  c-l;iys  overlain  hy  superficial  deposits  (compare  section  on  page  386) —  -       382 


PLATE  LXXVII. 


PLATE    LXX  VII. 

Page. 
Exposures  at  Terra  Cotta,D.  C.,in  the  railroad  cutting  looking  ea-st,  showing  irrfgularly  hedded  Rappa- 
hannock sands  inclosing  clay  lenses.     The  two  views  overlap  nearly  half  their  width  and  repi-esent 
about  100  feet  from  noi-th  to  south,  Fig.  1  being  the  more  northerly 383 


U.  S.  QEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII      PL.  LXXVII 


EXPOSURES    OF    THE    POTOMAC     FORMATION    AT    TERRA    COTTA,     D.    C. 


PLATE   LXXVIII. 


PLATE    LXXVIII. 

Page 

Exposures  at  Freestone,  Va.,  in  railroad  cutting,  looking  west 385 

Fig.  1.  North  end  of  cut,  showing  Rappahannock  sand  with  a  stratum  of  green  clay  and  below  it 

on  the  right  a  lens  of  the  same. 
Fig.  2.  South  end  of  cut,  Rappahannock  sand  with  large  lens  of  green  clay  near  the  top,  running 
out  on  the  left. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXVIII 


EXPOSURES    OF    THE    POTOMAC    FORMATION    AT    FREESTONE,     VA. 


.# 


PLATE   LXXTX. 


PLATE    LXXIX. 

Page. 

Exposures  on  Back  Lick  Run  5  miles  southwest  of  Alexandria,  Va.,  looking  east 386 

Fig.  1.  Cross-bedded  Rappahannock  sands  with  lenses  of  green  clay. 
Fig.  2.  Pure  white  lenticularly  bedded  Rappahannock  sands. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXIX 


.    ^^y^ 

^•^ 

■MfP  ^  jjl^iil^te^  tI 

^^B^SHflftK'      iJtiirffjtflffniBfllii 

Mi 

EXPOSURES    OF    THE    POTOMAC    FORMATION    ON     BACK    LICK    RUN,  VIRGINIA. 


PLATE   LXXX. 


PLATE    LXXX. 

Page. 
Map  showing  the  distribution  of  the  formations  of  tlie  Potomac  group  in  Maryland,  the  District  of 
Cokimbia,  and  adjacent  parts  of  Virginia,  with  indication,  by  numbers,  of  the  localities  at  which 
fossils  and  other  objects  mentioned  in  the  text  have  been  found 412 


PLATE    LXXXI. 


PLATE    LXXXI. 

Maryland  Potomac  Cycads. 

Page. 
Ctcadeoidea  maeylandica  (Font.)  Cap.  &  Solms.     Side  and  base  view  of  the  Johns  Hopkins  Univer- 
sity Cycad,  No.  1 :  al.so  of  siUcified  wood  from  the  Potomac  formation  of  Maryland,  from  a  photo- 
graph by  Tyson 41 9 

(For  historical  account,  see  p.  410.) 


PLATE    LXXXII. 


PLATE    LXXXII. 

Maryland  Potomac  Cycads. 

Page 
Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms.     View  of  Johns  Hopkins  Univei'sity  Oycad,  No.  2. 

from  a  photograph  b}'  Tyson. 421 

(For  historical  account,  see  p.  410.) 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXXII 


TRUNK    OF    CYCAD    EARLY    DISCOVERED    IN     THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE   LXXXIII. 


PLATE    LXXXIII. 

Maryland  Potomac  Ctcads. 

Page. 
Figs.  1-3.  Group  of  cycads,  from  a  photograph  by  Tyson  (for  historical  account,  see  p.  414). 
Figs.  1,2.  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms. 

Fig.  1 .  Side  and  top  view  of  Johns  Hopkins  University  Cycad,  No.  1 .       422 

Fig.  2.  Side  view  of  Johns  Hopkins  University  Cycad,  No.  3 422 

Fig.       3.  Cycadeoidea  Bibbinsi  Ward,  Johns  Hopkins  University  Cycad,  No.  4 458 

Fig.       4.  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms. 

View  of  the  base  of  the  Link  trunk,  No.  1481,  of  the  museum  of  the  Woman's  College  of 

Baltimore 422 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXXIII 


'  '^i*^V'^^'^^fe^  *:?'«se' 


I       I      I      I      I       I      I      I      I       I  CENTIMETERS  I 


I  DECIMETERSI 


TRUNKS    OF    CYCADS    EARLY    DISCOVERED    IN    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  LXXXIT. 


PLATE    LXXXIV. 

Maryland  Potomac  Cycads. 

Group  ot  cycads  in  tlie  museum  of  tlie  Johns  Hopkins  Univereity,  Baltimore. 

Figs.  1,2.  Cycadeoidea  mahylandica  (Font.)  Cap.  &  Solms.  Page. 

Fig.  1.  Side  view  of  Johns  Hopkins  University  Cycad,  No.  ."i 422 

Fig.  2.  Johns  Hopkins  University  Cycad,  No.  3 423 

Fig.        3.  Cycadeoidea  Bibbinsi  Ward,  Johns  Hopkins  Univei-sity  Cycad,  No.  4 458 


.1  i 


PLATE   LXXXV. 


PLATE    LXXXV. 

Maryland  Potomac  Cycads. 

C'ycadeoidea  Bibbinsi  Ward.  Page. 

View  of  tlie  external  surface  of  the  fragment  sent  by  Philip  Tvson  to  Sir  William  Dawson,  known 

as  the  Dawson  Cvcad .  -  -  - 459 

(For  historical  account  see  p.  409.)  • 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  LXXXV 


TRUNK    OF    CYCAD    EARLY    DISCOVERED    IN    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  LXXXVI. 


PLATE    LXXXVI. 

Maryland  Potomac  Cycaus. 
Cycadeoidea  Fontaineana  Ward.  Page, 

View  of  the  external  surface  of  the  South  Carohna  College  Cycad 442 

(For  historical  account  see  p.  411.) 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIM      PL.  LXXXVI 


TRUNK    OF    CYCAD    EARLY    DISCOVERED    IN    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE   LXXXVII 


PLATE    LXXXVII. 

Maryland  Potomac  Cycads. 

Group  of  Cycads  in  the  Museum  of  the  Woman's  College  of  Baltimore. 

Page. 

Fig.      1, 1.  The  Turner  trunk:  No.  3046,  Cycadeoidea  Fontaineana  Ward 443 

Fig.      I,  2.  The  Tubbs  trunk :  No.  1 465,  Cycadeoidea  Blbeinsi  Ward 460 

Fig.      1, 3.  The  Wilson  trunk ;  No.  1479,  Cycadeoidea  Gouciieriana  Ward 452 

Fig.      i,  4.  The  Pollv  Jones  trunk;  No.  1427,  Cycadeoidea  Bibbinsi  Ward 460 

Fig.      I,  5.  The  R.  f.  Donaldson  trunk.  No.  1 ;  No.  1472,  Cycadeoidea  Tysoniana  Ward 433 

Fig.      1, 6.  The  Weston  trunk;  No.  1468,  Cycadeoidea  Bibbin.si  Ward 460 

Fig.      1, 7.  The  Dennis  Butler  trunk ;  No.  1462,  Cycadeoidea  Bibbinsi  Ward 460 

Fig.     II,  1  ■  The  Robinson  trunk ;  No.  1487,  Cycadeoidea  Bibbinsi  Ward 460 

Fig.     II,  2.  The  Lintliicuni  fragment ;  No.  1484,  Cycadeoidea  Bibbinsi  Ward 461 

Fig.     11^3-  The  Link  trunk;  No.  1481,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solnis 423 

Fig.     ii!  4.  The  Doisev  trunk:  No.  6353,  Cycadeoidea  Bibbinsi  Ward 461 

Fig.     II,  5.  The  Reinsiiyder  trunk;  No.  6344,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solnis 424 

Fig.     ii!6.  The  Hehvig  trunk;  No.  3328,  Cycadeoidea  m-^rylandica  (Font.)  Cap.  &  Solms 424 

Fig!     II,  7.  The  R.  T.  Donaldson  fragment.  No.  3 ;  No.  3324,  Cycadeoidea  marylandica  (Font. )  C.  &  S .  424 

Fig.     u,  8.  The  All-Saints  tmnk;  No.  1466,  Cycadeoidea  Bibbinsi  Ward 456 

Fig.     ii!  9.  The  Gray  trunk;  No.  6354,  Cycadeoidea  Bibbinsi  Ward 462 

Fig.  ii,  10.  The  Smith  ti-unk;  No.  1482,  Cycadeoidea  Bibbinsi  Ward 462 

Fig.  n,  11.  The  Smith  fragment ;  No.  1483,  Cycadeoidea  Bibbinsi  Ward 462 

Fig.    Ill,  1.  The  Lester  trunk;  No.  3056,  Cycadeoidea  m.^rylandica  (Font.)  Cap.  &  Solms 424 

Fig.   mi  2.  The  Griffith  tmnk;  No.  1467,  Cycadeoidea  Fontaineana  Ward 443 

Fig.    in,  3.  The  Clark  trunk;  Nos.  16.59,  1659a,  Cycadeoidea  McGeeana  Ward 435 

Fig.    Ill,  4.  The  Crook  fragment;  No.  1428,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms 425 

Fig.    \u,  5.  The  Can-  trunk ;  No.  1463,  Cycadeoidea  Bibbinsi  Ward 463 

Fig.    Ill,  6.  The  Noah  Donaldson  trunk;  No.  1470,  Cycadeoidea  Fontaineana  Ward 443 

Fig.    Ill,  7.  The  Welsh  trunk;  No.  1464,  Cycadeoidea  Bibbinsi  Ward 464 

Fig.    mi  8.  The  Riddle  fi-agment;  No.  1488,  Cycadeoidea  Fontaineana  Ward 443 

Fig.   m,  9.  The  Hegeman  trunk;  No  6345,  Cycadeoidea  Fisiier.^;:  Ward,  n.  sp 471 

Fig.  in,  10.  The  M.  A.  Donaldson  trunk;  No.  1471,  Cycadeoidea  McGeeana  Ward 435 

Fig.    IV,  1.  The  Comegys  fragment;  No.  1658,  Cycadeoidea  Fontaineana  Ward 444 

Fig.    ivi  2.  The  Harman  trunk;  No.  1426,  Cycadeoidea  Bibbinsi  Ward 464 

Fig.    IV,  3.  The  R.  P.  Disney  fragment.  No.  1 ;  No.  3348,  Cycadeoidea  Bibbinsi  Ward 464 

Fig.    IV, 4.  The  R.  P.  Disney  trunk,  No.  1;  No.  6343,  Cycadeoidea  marylandica  (Font.)  C.  &  S 425 

Fig.    ivi  5.  The  Harwood  trunk;  No.  3050,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solnis 425 

Fig.    IV,  6.  The  Ring  fragment ;  No.  1480,  Cycadeoidea  Bibbinsi  Ward 465 

Fig.    IV,  7.  Tlie  K.  P.  Disney  trunk,  No.  2;  No.  6352,  Cycadeoidea  Fontaineana  Ward 444 

Fig.    IV,  8.  The  Snowdon  fragment ;  No.  3054,  Cycadeoidea  Bibbinsi  W^ard 465 

Fig.    IV,  9.  The  R.  P.  Disney  fragment.  No.  2;  No.  6348,  Cycadeoidea  Fontaineana  Ward 444 

Fig.  IV,  10.  The  Crook  fragment.  No.  2:  No.  1429,  Cycadeoidea  IT,ileri  Ward 454 

Fig.  IV,  11.  The  Travers  fragment;  No.  1478,  Cycadeoidea  Bibbinsi  Ward 466 

Fig.  IV,  12.  The  R.T.Donaldson  fragment.  No.  6;  No.  3341, Cycadeoidea  marylandica  (Font.)C.&S. .  426 

Fig.  IV,  13.  The  Tubbs  fragment;  No.  1192,  Cycadeoidea  marylandica  (Font. )  Cap.  &  Solms 427 

Fig.  IV,  14.  The  Morgan  trunk;  No.  3051,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms 427 

Fig.  iy,  15.  The  Inglehart  fragment.  No.  1 ;  No.  3325,  Cycadeoidea  McGeeana  Ward 436 

Fig.     V,  1.  The  Cole  fragment-  No.  3122,  Cycadeoidea  Fontaineana  Ward 444 

Fig.     v,2.  The  Harrison  fragment ;  No.  1486,  Cycadeoidea  marylandica   (Font. )  Cap.  &  Solms 427 

Fig.     v,3.  TheR.T.Donaldsonfragment,No.2;  No.  1656,Cycadeoidea marylandica  (Font.)C.&S. .  428 

Fig.     V,  4.  The  Giles  fragment;  No.  3352,  Cycadeoidea  Tysoniana  Ward 433 

Fig.     V,  5.  The  Owens  fragment;  No.  3057,  Cycadeoidea  marylandica  (Font.)  Cap.  &  Solms 428 

Fig.     v',6.  The  R.P.Disney  fragment,  No.  3;  No.  6350.  Cycadeoidea  marylandica  (Font.)  C.&S 428 

Fig.     v,7.  TheR.T.Donaldsonfragment,No.7;  No. 6349, Cycadeoidea  marylandica  (Font.)C.(kS.  .  428 

Fig.     V,  8.  The  Deakins  fragment ;  "No.  3055,  Cycadeoidea  McGeeana  Ward 436 

Fig.     V,  9.  The,  Luther  Welsh  fragment;  No.  3323,  Cycadeoidea  McGeeana  Ward 436 

Fig.  V,  10.  The  Inglehart  fragment;  No.  6347,  Cycadeoidea  Fontaineana  Ward 444 

Fig.   V,  11.  The  Magi-uder  fragment;  No.  1489,  Cycadeoidea  Fontaineana  Ward 445 

Fig.   V,  12.  The  R.  P.  Disney  fragment;  No.  6351,  Cycadeoidea  Bibbinsi  Ward 466 

Fig.   V,  13.  The  Emmons  fragment ;  No.  3346,  Cycadeoidea  Fontaineana  Ward 445 

Fig.   V,  14.  The  Odensoss  fragment ;  No.  3347,  Cycadeoidea  Fontaineana  Ward 445 

Fig.   v,15.  The  Sinmis  fragment;  No.  3047,  Cycadeoidea  Bibbinsi  Ward 466 

Fig.   V,  16.  The  AndoTson  fragment;  No.  6346, Cycadeoidea  Fontaineana  Ward 445 

Fig.    V,  17.  The  D.  O.  Donaldson  fragment;  No.  1657.  Cycadeoidea  marylandica  (Font.)  C.  &  S  .. .  429 

Fig.   V,  18.  The  R.  T.  Donaldson  fragment.  No.  4;  No.  3326,  Cycadeoidea  Fontaineana  Ward 445 

Fio.   V,  19.  The  W.  P.  Disnev  fragment;  No.  ,3349,  Cycadeoidea  McGeeana  Ward 437 

Fig.   V,  20.  The  White  fragment;  No.  3068,  Cycadeoidea  McGeeana  Ward 437 

Fig.   v,21.  The  R.  T.  Dimaldson  fragment,  No.  1;  No.  1473,  Cy.\cdeoidea  Fontaineana  Ward 445 


PLATE    LXXXVIII. 


PLATE    LXXXVIII. 

Marit^and  Potomac  Cycads. 

Cycadeoiuea  MARYLANDICA   (Font. )  Cap.  &  Solms.  Pago. 

View  of  the  Link  trunk,  No.  1481,  of  the  museum  of  tlie  Woman'.s  College  of  Baltimore,  restored  to 
its  place  in  the  Link  Gulch,  near  Arbutus,  Maiyland,  also  showing  the  exposure  as  seen  from  the 
west  side,  looking  across  the  gulch 429 


PLATE   LXXXIX. 


Fio.  I 

1 

Fia.  I 

2. 

Fig.  I 

3. 

Fig.  1 

4. 

Fig.  I 

5. 

Fig.  m 

1. 

Fig.  II 

2. 

Fig.  II 

3. 

Fig.  II 

4. 

Fig.  II 

•5. 

Fig.  II 

6 

Fig.  u 

7. 

Fig.  11 

8. 

Fig.  Ill 

1 

Fig.  Ill 

2 

Fig.  Ill 

3. 

Fig.  Ill 

4. 

Fig.  Ill 

■5 

Fl.i.  HI 

(i 

Fig.  Ill 

7 

Fig.  Ill 

fS 

Fig.  Ill 

9 

Fig.  hi 

10 

Fig.  hi 

11 

PLATE    LXXXIX. 

Maryland  Potomac  Cycads. 

Guoui'  OF  Cycads  in  the  museum  oe  the  Woman's  College  oe  Baltimore. 

IMgc. 

The  Whitehead  ti'iink,  No.  2;  No.  90.51,  Cycadeoidea  Fontaineana  Ward 44(i 

The  Whitehead  trunk,  No.  1;  No.  EOSO,  Cycadeoidea  Clarkiana  Ward  n.  sp 473 

The  Dearstine  trunk;  No.  9049,  Cycadeoidea  Gouchekiana  Ward 452 

The  R.  T.  Donaldson  trunk,  No.  2;  No.  90.52,  Cycadeoidea  Clarkiana  Ward  n.  sp 473 

The  Travels  trunk;  No.  6356,  Cycadeoidea  Bibbinsi  Ward 467 

The  R.  T.  Donaldson  fragment,  No.  9;  No.  9047,  Cycadeoidea  McGeeana  Ward 437 

The  Marlowe  fragment.  No.  2;  No.  9059,  Cycadeoidea  Bibbinsi  Ward 467 

The  Allen  fragment,  No.  1;  No.  9046,  Cycadeoidea  marylandica  (Pont.)  Cap.  &  Solnis..  429 

The  R.T.  Donaldson  fragment, No.  14;  No.  9058,  Cycadeoidea  marylandica  (Font.)  Cap. 

&  Solms - - 430 

The  David  Ring  trunk;  No.  63.57,  Cycadeoidea  Bibbinsi  Ward 468 

The  Allen  fragment,  No.  2;  No.  9048,  Cycadeoidea  Bibbinsi  Ward 468 

The  R.  P.  Disney  fragment,  No.  6;  No.  6359,  Cycadeoidea  marylandica  (Font.)  Cap.  & 

Solms - 430 

The  R.  T.  Donaldson  fragment,  No.  13;  No.  9057,  Cycadeoidea  McGeeana  Ward 437 

The  R.  T.  Donaldson  fragment.  No.  10;  No.  9053,  Cycadeoidea  Fontaineana  Ward 446 

The  R.  P.  Disney  fragment,  No.  5;  No.  6358,  Cycadeoidea  marylandica  (Font.)  Cap.  & 

Solms -  430 

The  Marlowe  fragment.  No.  3;  No.  9061,  Cycadeoidea  Fontaineana  Ward 446 

The  Travers  fragment.  No.  2;  No.  9060,  Cycadeoidea  McGeeana  Ward. 438 

The  R.T.  Donaldson  fragment.  No.  17;  No. 9065, Cycadeoidea  marylandica  (Font.) Cap. 

&  Solms 430 

The  R.  T.  Donaldson  fragment.  No.  15;  No.  9062,  Cycadeoidea  Fontaineana  Ward...  446 

The  R.  T.  Donaldson  fragment,  No.  16;  No.  9064,  Cycadeoidea  Fontaineana  Ward 446 

The  R.  T.  Donaldson  fragment,  No.  8;  No.  8319,  Cycadeoidea  marylandica  (Font.)  Cap. 

&  Solms :-  430 

The  Marlowe  fragment ,  No.  1 ;  No.  9055,  Cycadeoidea  McGeeana  Ward 438 

The  R.  T.  Donaldson  fragment,  No.  11;  Nb.  9054,  Cycadeoidea  McGeeana  Ward 438 

The  R.  T.  Donaldson  fragment,  No.  12;  No.  9056,  Cycadeoidea  Fontaineana  Ward  .  ..  447 


PLATE   XC. 


PLATE    XC. 

Maryland  Potomac  Cycads. 

Pago. 
Thp  Link  trunk,  Cvcadeoidea  marylandica  (Font.)  Cap.  &  Solnis,  No.  1481   of  the  museum  of  the 

Woman's  College  oC  Baltimore - 431 


PLATE   XCL 


PLATE    XGI. 

Maryland  Potomac  Cycads. 

Page. 
The  Helwig  tnaiik,  Cycadeoidea  maryi,andica  (Font.)  Cap.  &  Solms,  No.  3328  of  the  niusnini  of  llie 

Woman's  College  of  Baltimore _ .  _ 431 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XCI 


CENTIMETERS  I 


CYCADEOIDEA  MARYLANDICA. 


PLATE  XCII. 


PLATE    XCII. 

Maryland  Potomac  Cycads. 

Page. 
Trunk,  No.  1 .  of  the  museum  of  the  Maryland  Academy  of  Sciences,  Cycadeoidea  maeylandica  (Font.) 

Cap.  &  Sohiis.     Two  views  of  opposite  sides — 432 


PLATE   XCin. 


PLATE    XCIII. 

Maryland  Potomac  Cycads. 

Page. 
The  R.  T.  Donaldson  trunk,  No.  1,  Cycadeoidea  Ttsoniana  Ward,  No.  1472,  of  tlie  Woman's  College 

of  Baltimore _ _ _ _ 433 


.  GEOLOGICAL  SURVEY 


CYCADEOIDEA    TYSONIANA. 


PLATE  XCIV. 


PLATE    XCIV. 

Maryland  Potomac  Cycads. 

CrcADEOiDEA  McGeeana  Ward.  Page. 

The  Clark  trunk,  otherwise  known  as  the  "insect  nest,"  consisting  of  Nos.  1659  and  1659a  of  the 

museum  of  the  Woman's  College  of  Baltimore 438 


PLATE  XCV. 


PLATE    XCV. 

Maryland  Potomac  Cycads. 

OyCADEOlDEA    FoNTAINEANA    Ward.  Page 

View  of  the  top  of  the  Turner  trunk  or  "Chicken  trough,"  No.  3046  of  the  museum  of  the  Woman's 
College  of  Baltimore,  showing  the  deep  cavity  or  "crow's  nest"  used  as  a  receptacle  for  water 
for  domestic  fowls 447 


PLATE  XCTI. 


PLATE    XCVI. 

Maryland  Potomac  Cycads. 

Cycadeoidea  FoNTAiNEANA  Ward.  Page. 

Longitudinal  section  through  the  Griffith  trunk,  No.  1467  of  the  museum  of  the  Woman's  College 

of  Baltimore,  showing  the  internal  structure  and  terminal  bud 447 


PLATE  XCVII. 


PLATE    XCVII. 

Maryland  Potomac  Cycads. 

CrCADEOlDEA   FoNTAINEANA  Ward.  i'age. 

Fig.  1.  The  Noah  Donaldson  trunk,  No.  1470  of  the  Woman's  College  of  Baltimore 448 

Fig.  2.  The  Cronmiller  fragment,  No.  1485  of  the  Woman's  College  of  Baltimore 449 

Fig.  3.  The  Griffith  trunk,  No.  1467  of  the  Woman's  College  of  Baltimore 449 

Fig.  4.  Interior  view  of  the  Magruder  fragment,  No.  1489  of  the  Woman's  College  of  Baltimore. .  449 

Fig.  5.  The  Anderson  fragment.  No.  6346  of  the  Woman's  College  of  Baltimore 450 


PLATE  XCVIII. 


PLATE    XCVIII. 

Maryland  Potomac  Cycads.. 

Cycabeoidea  Fontaineana  Ward.  Page. 
Fig.  1.  View  from  above  of  the  R.  P.  Disney  trunk,  No.  2,  being  No.  6352  of  tlie  museum  of  the 

Woman's  College  of  Baltimore 450 

Fig.  2.  View  of  the  base  of  the  same _. 450 


U.  3.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  XCVIII 


r    I     ^  -  i 


flCENTI  METERS  I 


maw     isai  centimetfrs-i 


CYCADEOIDEA    FONTAINEANA. 


PLATE  XCIX. 


PLATE    XCIX. 

Maryland  Potomac  Cycads. 

Cycadeoidea  GoncHERiANA  Ward. 

Side  view  of  the  Wilson  trunlc,  No.  1479  of  the  museum  of  the  Woman's  College  of  Baltimore. 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH  XLVIII     PL.  XCIX 


btj      Wl     IM  ^^-NTIMETERS] 


CYCADEOIDEA    GOUCHERIANA, 


PLATE   C. 


PLATE    C. 

Maryland  Potomac  Cycads. 

Gycadeoidea  Uiileri  Ward.  Paee. 

Side  view  of  the  Les  trunk,  No.  2  oi'  the  museum  of  the  Maryland  Academy  of  Sciences _  .       455 


u.  s.  aeoLOGiCAL  survey 


MONOGRAPH   XLVIII     PL.  C 


CENTIMETERS  I 


CYCADEOIDEA    UHLERI. 


PLATE  CI. 


PLATE    CI. 

Maryland  Potomac  Cycads. 

Cycadeoidea  Bibbinsi  Ward.  Page. 

Side  view  of  the  Polly  Jones  tmnlv,  No.  1427  of  the  museum  of  the  Woman's  College  of  Baltimore.       468 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CI 


■WMCENTIMETERSl 


CYCADEOIDEA    BIBBINSI. 


PLATE  CII. 


PLATE    C  1 1  . 

Maryland  Potomac  Cycads. 

Cycadeoidea  Bibbinsi  Ward.  Page. 

Fig.  1.  Side  view  of  the  Dennis  Butler  trunk,  No.  1462  of  the  museum  of  the  Woman's  College 

of  Baltimore 469 

Fig.  2.  Side  view  of  the  Tubbs  trunk,  No.  146.5  of  the  museum  of  the  Woman's  College  of  Balti- 
more  - - . -  - 469 


PLATE  cm. 


PLATE    cm. 

Maryland  Potomac  Cycads. 

Cycadeoidea  Bibbinsi  Ward.  Page. 

View,  natural  size,  of  a  radial  section  through  tlie  Smith  fragment,  No.  1483  of  the  museum  of 

the  Woman's  College  of  Baltimore 469 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  Clll 


CYCADEOIDEA    BIBBINSI. 


PLATE  CIV. 


PLATE    CIV. 

Maryland  Potomac  Cycads. 

Cycadeoidea  Bibbinsi  Ward.  Page. 

Side  view  of  the  Gray  trunk.  No.  6354  of  tlie  museum  of  the  Woman's  College  of  Baltimore -169 


PLATE  CT. 


PLATE    CV. 

Maryland  Potomac  Cycads. 

Cycadeoidea  FisuERiE  Ward  n.  sp.  Page. 
View  of  the  external  surface  of  the  Hegeman  trunk,  No.  6345  of  tlie  museum  of  the  Woman's  Col- 
lege of  Baltimore 47 1 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CV 


wiaia       t 


i;^.'^    -I  CENTIMETERS  I 


CYCADEOIDEA    FISHER/E. 


PLATE  CVI. 


PLATE    CVI. 

Maryland  Potomac  Cvcads. 

Cycadeoidea  Clarkiana  Ward  n.  sp.  Page. 

View  of  the  best  preserved  side  of  the  Whiteliead  trunk,  No.  9050  of  the  museum  of  the  Woman's 
College  of  Baltimore -..;.. 473 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CVI 


I-      WW       toJJ!!!       aw       mH       jNaceNTIMETERSl 


CYCADEOIDEA    CLARKIANA. 


PLATE  CVII. 


PLATE    CVII. 

Flora  of  the  Potomac  Formation. 

Page 

Fig.    1 .  Baierops7s  plhripartita  Font , 479 

Fig.    2.  Dioonites  Buciiianus  (Ett. )  Born .  479 

Fig.    3.  Feistmantelia  virginica  Font.   n.  sp 484 

Fig.    4.  Williamsonia  ?  gallinacea  Ward  n.  sp - 48.5 

FiG.    5.  Cyoadeospermum  obovatum  Font. 485 

Fig.    6.  Aealia  ?  vernonensis  Font.  n.  sp 492 

Fig.    7.  Celastrophyllum  Brittonianum  Hollick 493 

Fig.    8.  Ephedrites  ?  vernonensis  Font.   n.  sp 495 

Fig.    9.  Populophyllum  minutum  Ward  n.  sp 499 

Fig.  10.  Scleropteris  vernonensis  Ward 501 

Fig.  1 1 .  Anient  of  a  dicotyledon  ?  Font 515 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CVII 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    VIRGINIA. 


PLATE  CVIII. 


PLATE    CVIII. 

Flora  of  the  Potomac  Formation. 

Page 

Fig.          1.  DiooNiTEs  Buchianus  (Ett.)  Born _ 479 

Fig.          2.  Dioonites  Buchianus  abietinus  (G'pp  )  Ward ._ 486 

Fig.          3.  Celastrophyllu.m  alb.edomus  Ward  n  sp 4S9 

Fig.          4.  Gltptostrobus  brookensis  angustifolius  (Font. )  Kn 4S9 

Fig           5.  Aristolochi.ephyllum  ?  cellulare  Ward  n.  sp 492 

Fig.          6.  Celastropiivllum  Hunteri  Ward - -  494 

Fig.          7.  Cela.stropiiyllu.m  ?  saliciforme  Ward  n.  sp .  494 

Fig.          S.  Mvrica  brookensis  Font .^IS 

Figs.  9,  10.  Leptostrobus  ?  ovalis  Ward  nom.  nov _ 51 

Fig.  10.  Enlargement  of  Fig.  9,  X  2. 

Fig.         1 1 .  PopuLOPHTLLUM  MiNUTUM  Ward  n.  sp 532 

Fig.        12.  Ginkgo  1  acetaria  Ward  n.  sp 551 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH    XLVIII     PL.  OVIII 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    VIRGINIA. 


PLATE  CIX. 


PLATE    CIX. 

Flora  of  the  Potomac  Formation. 

Page. 

Fig.  1.  Aristolochi.ephyllum  crassinerve  Font 481 

Figs.      2,  3.  Menispermites  tenuinervis  Font. . ■ 497 

Figs.      4-6.  Pinus  vernonensis  Ward  n.  sp 497 

Fig.  7.  Potamogetophyllum  vernonense  Font.  n.  sp .- 500 

Figs.      8,9.  Sphenolepidium  Sternbergianum  densipolium  Font 515 

Fig.  10.  Equisetum  marylandicom  Font 517 

Fig.  11.  Sequoia  cycadopsis  Font... 533 

Figs.  12,  13.  Athkotaxopsis  expansa  Font,  'i 535 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CIX 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    VIRGINIA,     MARYLAND,    AND    DISTRICT 

OF    COLUMBIA. 


PLATE  ex. 


PLATE    ex. 

Flora  of  the  Potomac  Formation. 

*  Page. 

Fig.        1.  Glyptostkobus  brookensis  (Font. )  Ward. 495 

Figs.  2-4.  Populophyllum  menispekmoides  Ward  n.  sp 498 

Fig.        5.  Populus  .\uriculata  Ward 499 

Fig,        6.  Sterculia  elegans  Font.  ? - 502 

Figs.  7,  8.  Thinnfeldia  variabilis  Font - . .502 

Fig.        9.  Baieropsis  foliosa  Font 504 

Fig.      10.  Celastropiiyllum  brookense  Font.  ? ,  .505 

Fig.      1 1 .  Leptostrobus  longifolius  Font. 506 

Fig.      12.  Angiopteridium  strictineeve  Font 51 1 

Fig.      13.  Sequoia  ambigua  Heer - - 5.55 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CX 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION     OF    VIRGINIA. 


PLATE  CXI. 


PLATE    CXI. 

Flora  of  the  Potomac  Formation. 

Page. 

Figs.  1 ,  2.  Zamia  Washingtoniana  Ward .  503 

Fig.        3.  Baieropsis  longifolia  Font 505 

Fig.        4.  Onyciiiopsis  psilotoides  (Stokes  &  Webb)  Ward 506. 

Fig.        5.  Sassafras  eilobatum  Font.  ? 503 

Fig.        6.  Cladophleeis  falcata  Font 511 

Fig.        7.  Cladophleeis  virginiensis  Font 512 

Fig.        S.  Frenelopsis  ramosissima  Font. 512 

Fig.        9.  Rogeesia  angustifolia  parva  Font.  n.  var 523 

Fig.      10.  Saliciphyllu.\i  ellipticum  Font 524 

Fig.      1 1 .  Thyrsopteeis  decdrebns  Font 525 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII      PL.  CXI 


FOSSIL    PLANTS    FROM    THE    POTOMAC     FORMATION     OF    VIRGINIA    AND    MARYLAND. 


PLATE   CXII. 


PLATE    CXII  . 

Flora  of  the  Potomac  Formation. 

page 

Fig.  1.  Sphenolepidium  Sternbergianum  densifolium  Font 507 

Fig.  2.  Dryopteris  fredericksburgensis  (Font. )  Kn 512 

Figs.      .3,  4.  Quercophylldm  chinkapinense  Ward  n.  sp 513 

Figs.      5,  6.  Thyrsopteris  crassinervis  Font - 513 

Fig.  7.  Ctenopteris  insignis  Font.  ? - -  521 

Fig.  S.  Platypterygium  densinerve  Font.  ? 521 

Fig.  9.  Rogeksia  longifolia  Font. -  523 

Figs.  10,  11.  Sphenolepidium  Sternbergianum  densifolium  Font 524 

Fig.  12.  Ficus  myricoides  Hollick -  - 531 

Figs.  13-15.  PiNUS  sohista  Ward  n.  sp - - 531 


U.  S.  GEOLOQICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  OXIl 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    VIRGINIA,     MARYLAND,    AND    DISTRICT 

OF    COLUMBIA. 


PLATE  CXIII. 


PLATE    CXIII. 

Flora  of  the  Potomac  Formation. 

Page. 

Fig.          1.  Onychiopsis  psilotohjes  (Stokes  &  Webb)  Ward 518 

KiGS.    2,  3.  Thyksopteris  rabinervis  Font 518 

Figs.    4,  5.  Zamiopsis  insignis  Font -  525 

Fig.          6.  Brachyphyllum  crassicaule  Font. 529 

Figs.    7,  8.  Celastrophyllum  acdtidens  Font 529 

Figs.  9.  10.  Eucalyptus  rosierianus  Ward  n.  sp. 530 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CXIII 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND  AND    DISTRICT    OF    COLUMBIA. 


PLATE  CXIV. 


PLATE    CXIV. 

Flora  of  the  Potomac  Formation. 

Page. 

Fig.           1.   PODOZAMITES   PEDICELLATUS  Font 532 

Fig.        2.  Sapindopsis  variabilis  Font. 532 

Figs.  3,  4.  Cladophlebis  acuta  Font. 538 

Fig.        5.  Cladophlebis  acuta  angustifolia  Font,  n.  var 539 

Fig.        6.  Dyroptekis  angustipinnata  (Font. )  Kn 540 

Fig.        7.  Drtopteris  parvifolia  (Font. )  Kn. 541 

Figs.  8,  9.  Thinnfeldia  marylandica  Font.  n.  sp. 541 

Fig.      10.  Abietites  angusticarpus  Font - 556 


U.  S.  GEOLOGtCAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CXIV 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  CXV. 


PLATE    CXV. 

Flora  of  the  Potomac  Formation. 

Page. 

Fig.          1.  Sphenolepidium  Sternbergianum  densifoi.iu.m  Font 546 

Figs.    2,  3.  Abietites  m.4ceocarpus  Font. 548 

Figs.    4,  5.  Abietites  marylandicus  Font.  n.  sp 549 

Fig.          6.  Celastkophtlldm  obovatum  Font 550 

Figs.    7,  S.  Dbyopteris  heterophylla  (Font.)  Kn 550 

Figs.  9,  10.  Selaginella  mary'l.4ndica  Font.  n.  sp 553 

Fig.  10.  Enlargement  of  Fig.  9,  X  3. 

Fig.        11.  Williamsonia  ?  Bibbinsi  Ward  n.  sp 554 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CXV 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  CXVI 


PLATE    CXVI. 
Flora  of  the  Potomac  Formation. 

Page. 

Fig.        1 .  Leptostrobus  longifolius  Font.  ? 551 

Fig.        2.  Nageiopsis  eecurvata  Font.  ?_ 552 

Figs.  3,  4.  Pecopteris  vikginiensis  Font. 552 

Fig.        5.  Acrostichopteris  parvifolia  Font _ 55S 

Fig.        6.  Celastrophyllum  l-4.tifoliuii  Font 559 

Fig.        7.  Celastrophyllum  ?  marylandicum  Font.  n.  sp 559 


U.  S.  GEOLOQIGAL  SURVEY 


MONOGRAPH    XLVMI      PL.  CXVI 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE    CXVII 


PLATE    CXVII. 
Flora  of  the  Potomac  Formation. 

Page. 

Fig.        1.  Adiantites  parvifolius  Font.  n.  sp 5.58 

Figs.  2,  3.  Celastrophyllum  obovatcm  Font 560 

Figs.  4,  5.  Nageiopsis  angustifolia  Font. 560 

Fig.        6.  N.ageiopsis  heterophylla  Font 561 

Fig.        7.  Plantaginopsis  m arylandica  Font.  n.  sp 563 


U.  S.  GEOLOGICAL  SURVEY 


MONOGRAPH   XLVIII     PL.  CXVII 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  CXVIII. 


PLATE    CXVIII. 

Flora  of  the  Potomac  Formation. 

Fage. 

Figs.  1,  2.  Plantaginopsis  marylandica  Font.  ii.  sp 562 

Figs.  3,  4.  Prote-ephyllum  dentatum  Font 563 

Fig.        5.  Prote^phyllum  Uhleri  Font.  n.  sp 564 


U.  S.  QEOLOQICAL  SURVEY 


Monograph  xlviii    pl.  cxViiI 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


PLATE  CXIX. 


PLATE    CXIX. 

Flora  of  the  Potomac  Formation. 

Page. 

Fig.        1.  Thyrsoptems  Meek  i ana  Font 565 

Figs.  2-4.  Vitiphyllum  multifidum  Font 565 

Fig.        5.  Vitiphyllum  multifidum  Font 553 

Figs.  6,  7.  Pinites  Leei  Font.  n.  sp 570 

Fig.        8.  Araucarites  virginicus  Font 572 


u.  s.  eeoLOQicAL  survey 


MONOGRAPH   XLVIII     PL.  CXIX 


FOSSIL    PLANTS    FROM    THE    POTOMAC    FORMATION    OF    MARYLAND. 


